Combination radioreceiver and phonograph



May 24, 1932- ,1. L. CASSELL 1,360,078

COMBINATION RADIORE CEIVER AND PHQNOGRAPH Filed Jul 17, 1929 INVENTOR JOSEPH L. CASSELL.

ATTORN EY Patented y 2 19 i I F 1 1.3605078 .IosEPEL'. oAssELL, OF NE 2031 imiY isssrelron; v-nYMEsNmAssm-mimrrits; mos-WIRED r 11 1x1310; mm, 01*; NEW 0.1m, Y'.; A GDRPORATION-{O'E DELAzWA RE-I COMBINATION, RADioBn-oEivEmmmn-oano voafimefii .7

z: Amilifeationfiled 'rii 'y 17, 1925'. Serial roys'isie'sii j 1 This invention rellites to radio broadcast 10 according tdtheadjustnient of mining H andphonograph systems and particularly to condenser lL-fiAfter detectkin', the audio;

combination: ofa racl-io receiver and phonofrequency Waves are impressed on first/audio i graph repriochlcer having'circuits in common. st'age l2 through a couplinginterstagetrans An objectof the invention isto utilizeafn former 13, and thenifon second audio stage 5 electricalsound amplifier for radio reception 15" through an 'interstagef transforiner F 16. and phonograph reproduction Without dis- The audio frequency variations erexohanged' connecting eitl'rer'the radio portion or the into'ecousticvibrations:by receiver 1 phonograph portion from the common cir- The filaments of the vacuum-131th" cuit; ergize-d in p ara-lleffromabattery 9*, 'Wh11 I Anotherobjectof" the invention is toon: the griclf biasing potentials 'fortl'i'e bes o I A v able-theoperationofaradio andphonograpli audio-stages 12 and 1'5 are obtained from-a comhination'circuit separately orsimult'ane bittery' 201 Plate-potentials forthe 'vflouum, v-

".ouslyz i tubes aresupplie'd by ahigh potential b AL- further object of-tlie invention is toen- "tery-2la x I v H able-theoperdtion'otaneleotric'alsouncl amheaiiodes-of'the tulies' ofsta'ges 8 12 vnol plifier for either radio orphonograph repro 15 are comiecteol-t(' )""-tli batteryfl'lflthroughthe; dilation at its'optirnu'ln effieienoyend'without prinrary windings ofcoupl ingransformer's substantial alteration of the electri'cal" con- 7 lO'Em'clIG- and the' win'din g"ofjiair'etardttion 1, stants'o f either-therrclio=or'plionograpli'cir V coi -1118,- respectivelyij l cujits 'duringoperatibn; v f tectorgtulie' howe er, v A feature of the invention is that'the-combattery through "the "printer-y "Winding of bination"'ci'rcuit embodying the invention transformer 13' in seri'es-With' the windingjofi ni1y'be-locaterl'in :t'receiverfoabi-net snoop-1 anlctromagnetioreproducer 24i, the? repro yerzited- With-the cabinetqjerma nently" closed duoer wind in-g'beiing parallel with a poten jg as the connecting circuits-from' the phono= tiometer resistance 25";with its radjustable j graph reprod'ncer totheicoinrnon amplifier contact 29:" An-equa lizershuntsithe electro are always maintainal; i-Fi1rthermore-, the me grieticreprodiloer'24, 'afnd 'comprises a se r eff'ectiw impedance'ofthe-first' audio-ampli ri allyconneote'cl condenser 26 and "inductance a "tying transformer is substantiel ly "constant 27 This equalizer'el-imingtesneedle scratcl ata' ll times antltheeffeotofmecllztnical resonancein ,i @then features of the invention will" be" rep'roclucer. t-urn "mm-e28 is-sliownfijssoa; apparent'and the apparatusfer accomplishciatecliwith-the stylus ofthe electro rnzvg'netic' --;-ingthea boveobjects morefillly understood; reproduce-r in the wellknovvnmainnerr 7 byreferenceto-the;followingdescription imfi 'Iii'the'circuitshowniniFigiLorie position188 accompanying drawingsinwh i ehz' loftheed jiistable contactQQ entirely eliini Figure I schematic circuitare combiat flieeflect of the phonograph reprodii e- 3 nation radio and phonographreproducing ing-irp'paratusjfromthepIate circuitof des rz1ppi1Tatus embodying thein-vent-iori'; tector tube 9 Without severing the connection i Fig.- 2 is a front elevationa l view of the ofit-his circuit. When' thi's is= accomplished, 9o

control switch; and V I I 1 any voltage variations prod-ito'ed 'intli'ewin Fig;3 is across-sectional'view ofitheswitch ingof the PlCR-LI-p d GViGGQ l-F are-short c11 V ofFig;2". V 7 j cuitecl' i -ntl-v are not"*"impressect ztcross the i Referring, to th circuit ofFi'g; 1, carrier" primary windingwfj thefinterstxge transf- 7 l3 signa ling wavesnray be receivecl over either foreman-13. It isronly rlequi-red, theredioreg-tfo F95 antenna 5 or Wire circuit- 6 according to the adjustthecontactf29a'along'the resistanceflfi I settingof switch 4542\nd. impressed upon 'a to impress on thee-1min'fi requelroy fstgvge V i radio'irequency ampliigtingzsttgee 8. "(Sertain an clilfi various voltages'fromith edevice 24a 3" of these electrical vibrations ztne transmitted j A similanvolume ficontnoflii "ofomrecti'on in to detector-'9 throughmmonpling transformer with the; reception of? signal sifnomz-the mt-showm-pins 38 of dial 32 are insertediin appropriate holes in the dial 33.

.shaft .35 is contact 29 which travels over re? sistance 25, under control of dial 33. The

' sockets,-use special adaptors, or open the cabinet to transfer the reception from any. of the three sources shown. Also since theconnectenna 5 and wires 6 is shownasa potentiometer resistance with a contact 31. In

one position of contact 31 the impulses across the resistance 30 are entirely eliminated from reception in the receiver 17 The volume from these sources is controlled by the. positioning of the contact 31 along the resistance 30.

In operating the combination circuit described above, two volume control knobs which may be combined into a unitary control as shown in Figs. 2 and 3, corresponding to contacts 29 and 31may effectively disconnect either source of signals and vary the amplitude of their voltages on the input'of the amplifier 12. It is unnecessary to break any connection, remove any tubes from their tions are not broken, the interstage transformer 13may be designed to match the impedance between the reproducer and the audlo amplifier input circuit and between the radio portion of the systemand the audio amplifier:

'circuit'to permit the greatest energy transe fer therebetween and the least distortion.

In Figs. 2 and 3 the control dial for the circuit of Fig.- 1 is shown having two concentric'dial knobs 32 and 33 mounted on shafts 34 and 35, respectively. Theknobs are ro-' tatably attached to their respective'shafts by set screws 36 and 37while the shaft 34 is free to rotate within-the shaft when the knob ;.32 is pulled outwardly to disengage it from the knob33.- The knob 32 is adapted to slide outwardly on its shafts 34 within the limits of slot 39 in which is screw 36. These dial knobs operate as one when, in the position Mounted on the end ofshaft 34is contact 31*which' travels over resistance 3Qunder control of knob 32, and mounted on the end of shafts, resistances and contacts are insulated from one another except as connections are made to them in accordance with the circult of Fig. 1. SWitQhflO shown inFigs. 2 and 3 is the-switch 4 of Fig. 1 and permits the amplifying system to receive signaling impulses from either the aerial 5 or wired radio input ,6; v

. V In sucha unitary control device, the volume of each system may be controlled independently, each system'may be made operative and inoperative, and programs may be selected from'anyone-of three sources, from a single control point. Furthermore, if simultaneous receptionfrom the space or Wired radio and from the reproducer is desired, this may be accomplished by a slight pressure at the dial 32 to seat the pins'38 in their respective recesses of the. knob 33. When so engaged and the device manipulated, thevolume of one source will be decreased as the other is increased providing a rapid and simultaneous control of two systems. Such control is advantageous when it is desiredto recelve music over one source and a different type of'signals, such as speech over another source when properblending or fading is to be effected.

Although this'invention has been describedin one particular embodiment and cir(:uitar-" rangement, it is to be'understo'od that'it is not to. be limited except by the scope of'the appended claims.

What is claimedis: 1. In combinatiom'a carrier wave receiving circuit and anrelectro-magnetic reproducing unit, means. for controlling, the volume of the carrier wave s1gnals,.1ndependent means for similarly varying the signals from said r'eproducer, and means coactingwith both said means for simultaneously controlling the volume of the carrier wave signals and the signals from said reproducerin opposite sense.v r r V v V V 2. In combination, a phonograph reproducer unit, a carrier wave receivlng system including an audio frequency amplifier stage,

and means for simultaneously increasing the input to said audio frequency amplifier from one sOurce'and decreasing the input to said audio frequency amplifier from another.

source. I r 1 V v.

3. A combination in accordance with claim 2 in whichsaid means comprises a compound potentiometer having a plurality of concentric dials and a plurality of separate resistance units.

4. In combination, a phonographrepro- .7 Ii

ducer unit, a' carrier wave r-eceivin system including an audio frequency ampli er stage common to said unitand said-system, said unit and said system forming two sources of audio frequency waves, and means forinde pendently increasing the input to said audio frequency amplifier from one source andfor' independently decreasing the input to said audio frequency amplifier from thefother source, said means also' being adapted to simultaneously increase and decreaserthe re-, 3

spective'inputsto said audio'frequency am' plifier from said sources,

. A c omb1nat1on in accordance with claim 4,1nwh1ch said means comprises a compound potentiometer having a plurality of concen trio dials and resistance units adapted to be moved independently of oneanother.

6. A combination in accordance with claim 4, in which said means comprises a compound 7 potentiometer having a plurality of'concentric dials and resistance units adapted to be moved simultaneously; I

Signed at Ampere, in the county of Essex 1 and State of New Jersey, this 28th day of June, A. I). 1929. Y

JOSEPH, L. cAssELL. j? 

